Figure 6.

AR sequence rate versus GC content. Ancestral repeat (AR) sequence rate is expressed
as base pairs (bp) per 100 kilobases (kb). The reduced local GC content observed in
AR sequence reflects the process of deamination of methylated CpG to TpG dinucleotides
in vertebrate sequence over long evolutionary periods of time [3]. The solid line
represents the fit from a cubic smoothing spline, whereas the dashed line is the fit
from a robust linear regression.